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Been putting in the time to finally get to grips with some (light) cryptography, specifically GnuPG/PGP. I was aware it was used for encrypted email communication, but not that it could be used independently to encrypt/verify all types of text, and even binary files.

While I agree with the common criticism that it's learning curve is somewhat difficult, it's been very intriguing - I can see an immediate use case for encrypting SQL backups, and the possibilities from there are seemingly endless!